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Alaska
Science Center - Biological Science Office Lake Clark Fisheries Projects Overview (page 5) |
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Objective 3. Examine relative abundance of salmon through time. Scientists can now reconstruct long term changes in salmon abundance from lake sediment core analysis. Salmon impact fresh water environments via input of marine derived nutrients released from carcasses after spawning. This input can be quantified through stable isotope analysis and will vary depending on escapement. Therefore, downcore changes in the abundance of nitrogen isotopes will reflect changes in the numbers of returning fish. We are examining how salmon returns to Lake Clark fluctuated naturally in relation to historic climate records derived from tree ring data, before and after the advent of commercial fishing. See the Lake Core Analysis site for more information
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4. Determine
and map contemporary spawning sites and compare to historic data.
352 sockeye salmon were tagged from 1999-2001 to determine migration paths and final spawning destinations.
Fish were tracked every 5-10 days by air and boat.
Example of data derived from the telemetry study, different colored lines indicates the movements of a specific fish. The largest and last dot on the path, indicates the final spawning site.
This map indicates the final spawning destinations of radiotagged sockeye salmon in Lake Clark, 1999-2001. For further information please see the Lake Clark Radio Telemetry Project. (continued to page 6 of the Overview)
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